Session request: roadmap for git-repo, submodules and Gerrit

Originally requested by David Pursehouse, I think I'll talk about
repo, submodules and Gerrit.

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+# So what's up with the repo tool and submodules?
+
+This talk will present the current situation for submodules in Git,
+Gerrits ability to deal with the awesomeness of submodules and how
+we keep git-repo around.
+
+*Stefan Beller, Google*
+